Year	% (national estimate)
1963	21.75
1973	23.23
1984	21.98
2000	38.96
2001	36.982
2002	35.385
2003	35.708
2004	32.524
2005	36.559
2006	37.282
2007	38.969
2008	37.67
2009	36.128
2010	34.212
2011	33.861
2012	38.74
2013	39.837
2014	38.141
2015	37.261
2016	32.441
2017	32.718
2018	35.407
2019	38.238
2020	37.409
2021	40.512
2022	36.69
2023	32.68